TDD Exercise slides

1. TDD
Test Driven Development

2. Clean code that works

3. Two Rules
• Don’t write a single line of code unless you have a
failing automated test
• Eliminate duplication

4. Write a little test

5. Make the test work
(quick and dirty)

6. Eliminate all duplication
(Refactor)

7. Red/Green/Refactor

8. Why this rocks..
• Reduces defect density
• Reduces risk
• Interaction between developers
• Shippable software === Agile

9. Fear

10. Cups of Coffee Per Cup Total
Starbucks 25 4 100
Total 100

11. Cups of Coffee Per Cup Total
Starbucks 25 S$ 4 S$ 100
Highlands 15 VND 25,000 VND 375,000
Total ???

12. Cups of Coffee Per Cup Total
Starbucks 25 S$ 4 S$ 100
Highlands 15 VND 25,000 VND 375,000
Total S$ 125
SGD/VND 15,000

13. 7 USD +10 SGD = 14 USD
(if SGD to USD = 0.7)

14. 7 USD x 2 = 14 USD
let’s start small

15. 7 USD x 2 = undefined
oh boy …

16. 7 USD x 2 = 14 USD
but wait …

17. this.amount = 7 * 2
dependency —> duplication